linux-kernel - Re: [BISECTED/2.6.35+] Regression: Machine runs really slowly after commit f12a15be

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Date:	Mon, 09 Aug 2010 22:19:29 +0200
From:	Alexey Fisher <bug-track@...her-privat.net>
To:	john stultz <johnstul@...ibm.com>
Cc:	Priit Laes <plaes@...es.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [BISECTED/2.6.35+] Regression: Machine runs really slowly
 after commit f12a15be

On Mo, 2010-08-09 at 12:51 -0700, john stultz wrote:
> On Mon, 2010-08-09 at 21:38 +0200, Alexey Fisher wrote:
> > cat /sys/devices/system/clocksource/clocksource0/current_clocksource 
> > hpet
> > 
> > cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> > hpet acpi_pm 
> 
> 
> On Mon, 2010-08-09 at 22:43 +0300, Priit Laes wrote:
> > cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> > hpet
> > cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> > hpet acpi_pm 
> 
> 
> Ok. Good. Chris Wilson has created the following patch which should
> hopefully resolve this issue. It would be great if you could try booting
> with it to verify that there are no other problems lurking here.
> 
> Thanks again for the great bug reporting!
> 
> thanks
> -john
> 
> 
> From: Chris Wilson <chris@...is-wilson.co.uk>
> Subject: [PATCH] x86/hpet: Use the FSEC_PER_SEC constant for femto-second
>  periods
> 
> The current computation, introduced with f12a15be63, of FSEC_PER_SEC using
> the multiplication of (FSEC_PER_NSEC * NSEC_PER_SEC) is performed only
> with 32bit integers on small machines, resulting in an overflow and a
> *very* short intervals being programmed.  An interrupt storm follows.
> 
> Note that we also have to specify FSEC_PER_SEC as being long long to
> overcome the same limitations.
> 
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Signed-off-by: John Stultz <johnstul@...ibm.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> ---


This patch work for me. At least it boot.
Tank you.

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